define(function(request, exports, module) {
(function(window, undefined) {
    var engine = {
        ie: 0,
        gecko: 0,
        webkit: 0,
        khtml: 0,
        opera: 0,

        name: null,
        ver: null
    };
    var browser = {
        ie: 0,
        firefox: 0,
        safari: 0,
        konq: 0,
        opera: 0,
        chrome: 0,

        name: null,
        ver: null
    };
    var system = {
        win: false,
        mac: false,
        x11: false,
        iphone: false,
        ipod: false,
        ipad: false,
        ios: false,
        android: false,
        nokiaN: false,
        winMobile: false,
        wii: false,
        ps: false,

        name: null
    };
    var ua = navigator.userAgent;
    if (window.opera)
    {
        engine.ver = browser.ver = window.opera.version();
        engine.opera = browser.opera = parseFloat(engine.ver);
    }
    else if (/(?:opera|opr)(?:\/| )(\S+)/i.test(ua))
    {
        engine.ver = browser.ver = RegExp["$1"];
        engine.opera = browser.opera = parseFloat(engine.ver);
    }
    else if (/AppleWebKit\/(\S+)/.test(ua))
    {
        engine.ver = RegExp["$1"];
        engine.webkit = parseFloat(engine.ver);
        if (/Chrome\/(\S+)/.test(ua))
        {
            browser.ver = RegExp["$1"];
            browser.chrome = parseFloat(browser.ver);
        }
        else if (/Version\/(\S+)/.test(ua))
        {
            browser.ver = RegExp["$1"];
            browser.safari = parseFloat(browser.ver);
        }
        else
        {
            var safariVersion = 1;
            if (engine.webkit < 100) safariVersion = 1;
            else if (engine.webkit < 312) safariVersion = 1.2;
            else if (engine.webkit < 412) safariVersion = 1.3;
            else safariVersion = 2;
            browser.safari = browser.ver = safariVersion;
        }
    }
    else if (/KHTML\/(\S+)/.test(ua))
    {
        engine.ver = browser.ver = RegExp["$1"];
        engine.khtml = browser.konq = parseFloat(engine.ver);
    }
    else if (/rv:([^\)]+)\) Gecko\/\d{8}/.test(ua))
    {
        engine.ver = RegExp["$1"];
        engine.gecko = parseFloat(engine.ver);
        if (/Firefox\/(\S+)/.test(ua))
        {
            browser.ver = RegExp["$1"];
            browser.firefox = parseFloat(browser.ver);
        }
    }
    else if (/MSIE ([^;]+)/.test(ua))
    {
        engine.ver = browser.ver = RegExp["$1"];
        engine.ie = browser.ie = parseFloat(engine.ver);
    }
    
    browser.ie = engine.ie;
    browser.opera = engine.opera;
    var p = navigator.platform;
    system.win = p.indexOf("Win") == 0;
    system.mac = p.indexOf("Mac") == 0;
    system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);
    if (system.win)
    {
        if (/Win(?:dows )?([^do]{2})\s?(\d+\.\d+)?/.test(ua))
        {
            if (RegExp["$1"] == "NT")
            {
                switch (RegExp["$2"])
                {
                    case "5.0":
                        system.win = "2000";
                        break;
                    case "5.1":
                        system.win = "XP";
                        break;
                    case "6.0":
                        system.win = "Vista";
                        break;
                    case "6.1":
                        system.win = "7";
                        break;
                    default:
                        system.win = "NT";
                        break;
                }
            }
            else if (RegExp["$1"] == "9x")
            {
                system.win = "ME";
            }
            else
            {
                system.win = RegExp["$1"];
            }
        }
    }
    
    system.iphone = ua.indexOf("iPhone") > -1;
    system.ipod = ua.indexOf("iPod") > -1;
    system.ipad = ua.indexOf("iPad") > -1;
    system.nokiaN = ua.indexOf("nokiaN") > -1;
    if (system.win == "CE")
    {
        system.winMobile = system.win;
    }
    else if (system.win == "Ph")
    {
        if (/Windows Phone OS (\d+.\d+)/.test(ua))
        {
            system.win = "Phone";
            system.winMobile = parseFloat(RegExp["$1"]);
        }
    }
    if (system.mac && ua.indexOf("Mobile") > -1)
    {
        if (/CPU (?:iPhone )?OS (\d+_\d+)/.test(ua))
        {
            system.ios = parseFloat(RegExp["$1"].replace("_", "."));
        }
        else
        {
            system.ios = 2;
        }
    }
    if (/Android (\d+\.\d+)/.test(ua))
    {
        system.android = parseFloat(RegExp["$1"]);
    }
    system.wii = ua.indexOf("wii") > -1;
    system.ps = /playstation/i.test(ua);

    for (var param in engine)
    {
        if (param != "name" && param != "ver" && engine[param])
        {
            engine.name = param;
            break;
        }
    }
    for (var param in browser)
    {
        if (param != "name" && param != "ver" && browser[param])
        {
            browser.name = param;
            break;
        }
    }
    for (var param in system)
    {
        if (param != "name" && system[param])
        {
            system.name = param;
            break;
        }
    }
    var rst = {
        engine: engine,
        browser: browser,
        system: system
    };
    
    if (typeof module !== 'undefined' && module.exports)
        module.exports = rst;
    else
    {
        window.ua = ua;

        if (typeof define === 'function' && define.amd)
            define( "ua", [], function() { return rst; } );
    }
})(window);
})